Organic light emitting display device

ABSTRACT

An organic light emitting display device comprising: a substrate; a first pixel electrode disposed on the substrate; a pixel defining film disposed on the first pixel electrode and having a first opening at least partially exposing the first pixel electrode; a first organic light emitting layer disposed on the pixel defining film and overlapping with the first opening of the pixel defining film; and a black matrix disposed on the first organic light emitting layer and having a first opening overlapping with the first organic light emitting layer. Light having passed through the first opening of the black matrix is one of red light, green light, and blue light. The first opening of the black matrix may have a shape with a curved portion.

This application claims priority to Korean Patent Application No.10-2017-0085074 filed on Jul. 4, 2017 in the Korean IntellectualProperty Office, and all the benefits accruing therefrom under 35 U.S.C.119, the contents of which in its entirety are herein incorporated byreference.

BACKGROUND 1. Field of the Disclosure

The present disclosure relates to an organic light emitting displaydevice.

2. Description of the Related Art

Along with the development of multimedia, display devices are becomingincreasingly important. In response to this, several kinds of displaydevices such as a liquid crystal display (LCD) and an organic lightemitting display (OLED) have been used.

Among the display devices, OLEDs display images by using organic lightemitting devices that generate light through recombination of electronsand holes. OLEDs have benefits such as a fast response time, highbrightness, a large viewing angle, and low power consumption.

SUMMARY

Aspects of the present disclosure provide an organic light emittingdisplay device capable of alleviating reflected color separation due toexternal light.

Aspects of the present disclosure also provide an organic light emittingdisplay device capable of managing uniform dispersion and reducingreflectivity.

Aspects of the present disclosure also provide an organic light emittingdisplay device capable of reducing costs because no polarizing plate isused.

It should be noted that objects of the present inventive concept are notlimited to the above-described objects, and other objects of the presentinventive concept will be apparent to those skilled in the art from thefollowing descriptions.

An exemplary embodiment of the present inventive concept discloses adisplay device comprising: An organic light emitting display devicecomprising: a substrate; a first pixel electrode disposed on thesubstrate; a pixel defining film disposed on the first pixel electrodeand having a first opening at least partially exposing the first pixelelectrode; a first organic light emitting layer disposed on the pixeldefining film and overlapping with the first opening of the pixeldefining film; and a black matrix disposed on the first organic lightemitting layer and having a first opening overlapping with the firstorganic light emitting layer. Light having passed through the firstopening of the black matrix is one of red light, green light, and bluelight. The first opening of the black matrix may have a shape with acurved portion.

An exemplary embodiment of the present inventive concept also disclosesa display device comprising: an organic light emitting display devicecomprising: a substrate; a first pixel electrode disposed on thesubstrate; a pixel defining film disposed on the first pixel electrodeand having a first opening at least partially exposing the first pixelelectrode; a first organic light emitting layer disposed on the pixeldefining film and overlapping with the first opening of the pixeldefining film; and a black matrix disposed on the first organic lightemitting layer and having a first opening overlapping with the firstorganic light emitting layer. The first opening of the back matrix mayhave a smaller area than the first opening of the pixel defining film.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects and features of the present disclosure willbecome more apparent by describing in detail exemplary embodimentsthereof with reference to the attached drawings, in which:

FIG. 1 is a plan view showing a pixel layout of an organic lightemitting display device according to an embodiment of the presentinventive concept;

FIG. 2 is a sectional view taken along line I-I′ shown in FIG. 1;

FIG. 3 is a view for comparison between FIG. 1, which is a plan view ofa first pixel, and FIG. 2, which is a sectional view taken along lineI-I′;

FIG. 4 is a plan view showing a color filter and an opening of a blackmatrix of an organic light emitting display device according to acomparative example;

FIG. 5 is a view showing that color separation is alleviated in anorganic light emitting display device according to an embodiment of thepresent inventive concept;

FIG. 6 is a view showing color separation in the organic light emittingdisplay device according to the comparative example shown in FIG. 4;

FIG. 7 is a plan view showing a pixel layout of an organic lightemitting display device according to another embodiment of the presentinventive concept;

FIG. 8 is a sectional view taken along line II-II′ shown in FIG. 7;

FIGS. 9A and 9B is a view showing examples of the shape of an opening ofa black matrix shown in FIG. 7;

FIG. 10 is a view showing an interval between openings of a pixeldefining film adjacent to an organic light emitting display deviceaccording to another embodiment of the present inventive concept;

FIG. 11 is a plan view showing a pixel layout of an organic lightemitting display device according to another embodiment of the presentinventive concept;

FIG. 12 is a sectional view taken along line III-III′ shown in FIG. 11;

FIG. 13 is a plan view showing an opening of a black matrix and a colorfilter of an organic light emitting display device according to anotherembodiment of the present inventive concept;

FIG. 14 is a plan view showing an opening of a black matrix and a colorfilter of an organic light emitting display device according to stillanother embodiment of the present inventive concept;

FIG. 15 is a plan view showing a color filter and an opening of a blackmatrix of an organic light emitting display device according to acomparative example;

FIG. 16 is a plan view showing a pixel layout of an organic lightemitting display device according to another embodiment of the presentinventive concept;

FIG. 17 is a sectional view taken along line IV1-IV1′, line IV2-IV2′,and line IV3-IV3′ shown in FIG. 16;

FIG. 18 is a diagram illustrating an improvement of reflectivedispersion of the organic light emitting display device shown in FIG.16;

FIGS. 19, 20, 21, 22, 23, 24, 25 and 26 are diagrams illustrating aprocess of manufacturing the organic light emitting display device shownin FIG. 16;

FIG. 27 is a sectional view showing an organic light emitting displaydevice according to another embodiment of the present inventive concept;

FIG. 28 is a sectional view showing an organic light emitting displaydevice according to another embodiment of the present inventive concept;

FIG. 29 is a sectional view showing an organic light emitting displaydevice according to another embodiment of the present inventive concept;

FIG. 30 is a sectional view showing an organic light emitting displaydevice according to another embodiment of the present inventive concept;

FIG. 31 is a plan view showing a pixel layout of an organic lightemitting display device according to still another embodiment of thepresent inventive concept; and

FIG. 32 is a sectional view taken along line V1-V1′, line V2-V2′, andline V3-V3′ shown in FIG. 31.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the following description, for the purposes of explanation, numerousspecific details are set forth in order to provide a thoroughunderstanding of various exemplary embodiments. It is apparent, however,that various exemplary embodiments may be practiced without thesespecific details or with one or more equivalent arrangements. In otherinstances, well-known structures and devices are shown in block diagramform in order to avoid unnecessarily obscuring various exemplaryembodiments.

In the accompanying figures, the size and relative sizes of layers,films, panels, regions, etc., may be exaggerated for clarity anddescriptive purposes. Also, like reference numerals denote likeelements.

When an element or layer is referred to as being “on,” “connected to,”or “coupled to” another element or layer, it may be directly on,connected to, or coupled to the other element or layer or interveningelements or layers may be present. When, however, an element or layer isreferred to as being “directly on,” “directly connected to,” or“directly coupled to” another element or layer, there are no interveningelements or layers present. For the purposes of this disclosure, “atleast one of X, Y, and Z” and “at least one selected from the groupconsisting of X, Y, and Z” may be construed as X only, Y only, Z only,or any combination of two or more of X, Y, and Z, such as, for instance,XYZ, XYY, YZ, and ZZ. Like numbers refer to like elements throughout. Asused herein, the term “and/or” includes any and all combinations of oneor more of the associated listed items.

Although the terms first, second, etc. may be used herein to describevarious elements, components, regions, layers, and/or sections, theseelements, components, regions, layers, and/or sections should not belimited by these terms. These terms are used to distinguish one element,component, region, layer, and/or section from another element,component, region, layer, and/or section. Thus, a first element,component, region, layer, and/or section discussed below could be termeda second element, component, region, layer, and/or section withoutdeparting from the teachings of the present disclosure.

Spatially relative terms, such as “beneath,” “below,” “lower,” “above,”“upper,” and the like, may be used herein for descriptive purposes, and,thereby, to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the drawings. Spatiallyrelative terms are intended to encompass different orientations of anapparatus in use, operation, and/or manufacture in addition to theorientation depicted in the drawings. For example, if the apparatus inthe drawings is turned over, elements described as “below” or “beneath”other elements or features would then be oriented “above” the otherelements or features. Thus, the exemplary term “below” can encompassboth an orientation of above and below. Furthermore, the apparatus maybe otherwise oriented (e.g., rotated 90 degrees or at otherorientations), and, as such, the spatially relative descriptors usedherein interpreted accordingly.

The terminology used herein is for the purpose of describing particularembodiments and is not intended to be limiting. As used herein, thesingular forms, and “the” are intended to include the plural forms aswell, unless the context clearly indicates otherwise. Moreover, theterms “comprises,” “comprising,” “includes,” and/or “including,” whenused in this specification, specify the presence of stated features,integers, steps, operations, elements, components, and/or groupsthereof, but do not preclude the presence or addition of one or moreother features, integers, steps, operations, elements, components,and/or groups thereof.

Various exemplary embodiments are described herein with reference tosectional illustrations that are schematic illustrations of idealizedexemplary embodiments and/or intermediate structures. As such,variations from the shapes of the illustrations as a result, forexample, of manufacturing techniques and/or tolerances, are to beexpected. Thus, exemplary embodiments disclosed herein should not beconstrued as limited to the particular illustrated shapes of regions,but are to include deviations in shapes that result from, for instance,manufacturing. For example, an implanted region illustrated as arectangle will, typically, have rounded or curved features and/or agradient of implant concentration at its edges rather than a binarychange from implanted to non-implanted region. Likewise, a buried regionformed by implantation may result in some implantation in the regionbetween the buried region and the surface through which the implantationtakes place. Thus, the regions illustrated in the drawings are schematicin nature and their shapes are not intended to illustrate the actualshape of a region of a device and are not intended to be limiting.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure is a part. Terms,such as those defined in commonly used dictionaries, should beinterpreted as having a meaning that is consistent with their meaning inthe context of the relevant art and will not be interpreted in anidealized or overly formal sense, unless expressly so defined herein.

Hereinafter, exemplary embodiments will be described with reference tothe accompanying drawings.

FIG. 1 is a plan view showing a pixel layout of an organic lightemitting display device according to an embodiment of the presentinventive concept.

Referring to FIG. 1, a plurality of pixel units including first tofourth pixels PX1 to PX4 may be disposed in a pixel area DA.

An arrangement of the first to fourth pixels PX1 to PX4 will bedescribed with reference to FIG. 1. The first pixel PX1 and the thirdpixel PX3 may be disposed adjacent to each other in a first directiond1. The second pixel PX2 and the fourth pixel PX4 may be disposedadjacent to each other in the first direction d1. The first pixel PX1and the second pixel PX2 may be disposed adjacent to each other in asecond direction d2, which is a diagonal direction with respect to thefirst direction d1 and a third direction d3 which is perpendicular tothe first direction d1. The third pixel PX3 and the fourth pixel PX4 maybe disposed adjacent to each other in the second direction d2.

A plurality of color filters may include first, second, and third colorfilters CF1, CF2, and CF3. In this disclosure, the first color filterCF1 may be a red color filter, the second color filter CF2 may be agreen color filter, and the third color filter CF3 may be a blue colorfilter. However, the first color filter CF1, the second color filterCF2, and the third color filter CF3 are not limited to red, green, andblue color filters, respectively. For example, each of the first colorfilter CF1, the second color filter CF2, and the third color filter CF3may be any one of a cyan color filter, a magenta color filter, and ayellow color filter. Here, as an example, it will be described that thefirst color filter CF1 is a red color filter, the second color filterCF2 is a green color filter, and the third color filter CF3 is a bluecolor filter. In this disclosure, the same reference numeral will beused to describe color filters which transmit light in the samewavelength region.

The first pixel PX1 may overlap with the first color filter CF1. Thesecond pixel PX2 and the fourth pixel PX4 may overlap with the secondcolor filter CF2. Also, the third pixel PX3 may overlap with the thirdcolor filter CF3. Thus, the first pixel PX1 may display a red color, andthe second pixel PX2 and the fourth pixel PX4 may display a green color.Also, the third pixel PX3 may display a blue color.

Here, the first to fourth pixels PX1 to PX4, which display red, green,blue, and green colors, may constitute a single pixel unit. That is, asa red-green-blue-green (RGBG) pentile, the first to fourth pixels PX1 toPX4 may be disposed in the pixel area DA. However, the arrangement ofthe plurality of pixels disposed in the pixel area DA is not limited tothat shown in FIG. 1. For example, the arrangement of the plurality ofpixels may vary depending on the display colors of the pixels, theresolution and the aperture ratio of an applied organic light emittingdisplay device, and so on.

In this disclosure, the expression “a first element and a second elementoverlap with each other” indicates that the first element overlaps withthe second element when projected onto a first substrate 110.

Here, relations between a first pixel electrode 121, an opening OP1 a ofa pixel defining film 130 (see FIG. 2), and an opening OP2 a of a blackmatrix BM will be described on the basis of the first pixel PX1.

The first pixel PX1 may include the first pixel electrode 121. The firstpixel electrode 121 may be partially exposed by the opening OP1 a of thepixel defining film 130 (see FIG. 2). The first pixel electrode 121 mayoverlap with the opening OP1 a of the pixel defining film 130 (see FIG.2) and the opening OP2 a of the black matrix BM.

The first pixel electrode 121 may overlap with the first color filterCF1. More specifically, the first color filter CF1 may overlap with thefirst pixel electrode 121 by covering the opening OP2 a of the blackmatrix BM. Thus, the first pixel PX1 may display a red color becauselight emitted from a first organic light emitting layer 141 (see FIG. 2)becomes red after passing through the first color filter CF1.

As an example, the first pixel electrode 121 may have a rhombus shape.Also, as an example, the opening OP1 a of the pixel defining film 130(see FIG. 2) may have a rhombus shape. Here, the rhombus shape mayinclude the shape of a figure that is substantially the same as arhombus (e.g., a quadrangle) in consideration of a manufacturing processor the like, as well as the shape of a rhombus. The shape of the firstpixel electrode 121 and the shape of the opening OP1 a of the pixeldefining film 130 (see FIG. 2) are not limited to those shown in FIG. 1.That is, the shape of the first pixel electrode 121 and the shape of theopening OP1 a of the pixel defining film 130 (see FIG. 2) may varydepending on the arrangement of the plurality of pixels.

The shape of the opening OP2 a of the black matrix BM may have a curvedportion. In this disclosure, the term “curved portion” is defined as aregion having a predetermined curvature. Thus, the shape of the openingOP2 a of the black matrix BM may include a region having a predeterminedcurvature, i.e., a curved portion.

More specifically, the opening OP2 a of the black matrix BM may have asubstantially circular shape. That is, the planar shape of the openingOP2 a of the black matrix BM may be a curved line which is composed ofassemblies of dots that are spaced a certain distance apart from avirtual center point cp. The opening OP2 a of the black matrix BM mayomnidirectionally and uniformly induce diffraction of light on the basisof the virtual center point cp. This will be described in detail belowwith reference to FIGS. 3 to 6. In this disclosure, the circular shapemay include the shape of a polygon substantially close to a circle, anellipse, or a figure having at least one curved portion in considerationof a manufacturing process or the like, as well as the shape of acircle. Here, in this disclosure, a polygon close to a circle, anellipse, or a figure with at least one curved portion is described as a“circular shape.”

FIG. 2. is a sectional view taken along line I-I′ shown in FIG. 1. Thefollowing description will be provided with reference to the first pixelPX1, as described above.

Referring to FIGS. 1 and 2, the organic light emitting display deviceaccording to an embodiment of the present inventive concept may includethe first substrate 110, the first pixel electrode 121, the pixeldefining film 130, the first organic light emitting layer 141, a commonelectrode 150, an encapsulation layer 160, the black matrix BM, thefirst color filter CF1, the second color filter CF2, and the third colorfilter CF3.

The first substrate 110 may be an insulating substrate. As an example,the first substrate 110 may include materials such as glass, quartz, andpolymer resins. Here, the polymer materials may includepolyethersulphone (PES), polyacrylate (PA), polyarylate (PAR),polyetherimide (PEI), polyethylenenaphthalate (PEN),polyethyleneterephthalate (PET), polyphenylenesulfide (PPS),polyallylate, polyimide (PI), polycarbonate (PC), cellulosetriacetate(CAT), cellulose acetate propionate (CAP), or a combination thereof. Asanother example, the first substrate 110 may be a flexible substrateincluding polyimide (PI).

The first pixel electrode 121 may be disposed on the first substrate110. Although not shown, other elements may be additionally disposedbetween the first substrate 110 and the first pixel electrode 121. As anexample, the other elements may include a buffer layer, a conductivewire, an insulation layer, and a plurality of thin-film transistors.Here, the plurality of thin-film transistors may use amorphous silicon,polysilicon, low temperature polysilicon (LTPS), an oxide semiconductor,an organic semiconductor, or the like as a channel layer. The pluralityof thin-film transistors may have different types of channel layers. Asan example, both of a thin-film transistor including an oxidesemiconductor and a thin-film transistor including LTPS may be includedin one pixel, in consideration of roles or manufacturing processes ofthe thin-film transistors.

As an example, the first pixel electrode 121 may be an anode electrode.When the first pixel electrode 121 is an anode electrode, the firstpixel electrode 121 may include a high work function material tofacilitate hole injection. Also, the first pixel electrode 121 may be areflective electrode, a semitransparent electrode, or a transparentelectrode. As an example, the first pixel electrode 121 may include areflective material. The reflective material may include, as an example,one or more selected from the group consisting of silver (Ag), magnesium(Mg), chromium (Cr), gold (Au), platinum (Pt), nickel (Ni), copper (Cu),tungsten (W), aluminum (Al), aluminum-lithium (Al—Li), magnesium-indium(Mg—In), and magnesium-silver (Mg—Ag).

As an example, the first pixel electrode 121 may be formed as asingle-layered film, but is not limited thereto. That is, the firstpixel electrode 121 may be formed as a multi-layered film in which twoor more materials are stacked.

When the first pixel electrode 121 is formed as a multi-layered film,the first pixel electrode 121 may include, as an example, a reflectivefilm and a transparent or semitransparent electrode disposed above thereflective film. As another example, the first pixel electrode 121 mayinclude a reflective film and a transparent or semitransparent electrodedisposed below the reflective film. For example, the first pixelelectrode 121 may have a three-layered structure of ITO/Ag/ITO, but isnot limited thereto.

Here, the transparent or semitransparent electrode may include one ormore selected from the group consisting of indium tin oxide (ITO),indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In₂O₃), indiumgallium oxide (IGO), and aluminum zinc oxide (AZO).

The pixel defining film 130 may be disposed on the first pixel electrode121. The pixel defining film 130 includes the opening OP1 a that atleast partially exposes the first pixel electrode 121. The pixeldefining film 130 may include an organic material or an inorganicmaterial. As an example, the pixel defining film 130 may includematerials such as a photoresist, a polyimide resin, an acrylic resin, asilicon compound, and a polyacrylic resin.

The first organic light emitting layer 141 may be disposed on the firstpixel electrode 121. More specifically, the first organic light emittinglayer 141 may be disposed on a region of the first pixel electrode 121to cover the opening OP1 a of the pixel defining film 130. As anexample, the first organic light emitting layer 141 may at leastpartially cover a side wall of the pixel defining film 130.

As an example, the first organic light emitting layer 141 may emit redlight. That is, the first organic light emitting layer 141 may include ared light emitting material. As another example, the first organic lightemitting layer 141 may emit white light. That is, the first organiclight emitting layer 141 may include a white light emitting material.Unlike this, the first organic light emitting layer 141 may have a formin which a red light emitting layer, a green light emitting layer, and ablue light emitting layer are stacked to emit white light. In thisdisclosure, an example in which the first organic light emitting layer141 emits red light and the other organic light emitting layers emit anyone of red light, green light, and blue light will be described below.

Although not shown, the first organic light emitting layer 141 may havea multi-layered structure including a hole injection layer HIL, a holetransport layer HTL, an electron transport layer ETL, an electroninjection layer EIL, and so on.

The common electrode 150 may be disposed on the first organic lightemitting layer 141 and the pixel defining film 130. As an example, thecommon electrode 150 may be formed over the first organic light emittinglayer 141 and the pixel defining film 130. As an example, the commonelectrode 150 may be a cathode electrode. The common electrode 150 mayinclude one or more selected from the group consisting of Li, Ca,LiF/Ca, LiF/Al, Al, Ag, and Mg. Also, the common electrode 150 may beformed of a low work function material. As an example, the commonelectrode 150 may be a transparent or semitransparent electrodeincluding any one or more selected from the group consisting of indiumtin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide(In₂O₃), iridium gallium oxide (IGO), and aluminum zinc oxide (AZO).

The encapsulation layer 160 may be disposed on the first substrate 110to cover the first organic light emitting layer 141. That is, aplurality of organic light emitting devices including the first organiclight emitting layer 141 may be disposed between the first substrate 110and the encapsulation layer 160. The encapsulation layer 160 may blockpenetration of external oxygen and moisture into the plurality oforganic light emitting devices which include the first organic lightemitting layer 141.

As an example, the encapsulation layer 160 may have a form in which atleast one of an organic layer and an inorganic layer is stacked in asingle-layered structure or a multi-layered structure. The organic layermay include any one selected from the group consisting of epoxy,acrylate, and urethane acrylate. The inorganic layer may include any oneor more selected from the group consisting of silicon oxide (SiOx),silicon nitride (SiNx), and silicon oxynitride (SiONx). As an example,the encapsulation layer 160 may have a form in which a first inorganiclayer, an organic layer disposed on the first inorganic layer, and asecond inorganic layer disposed on the organic layer are stacked.

As another example, the encapsulation layer 160 may be a transparentinsulating substrate. When the encapsulation layer 160 is a transparentinsulating substrate, the transparent insulating substrate may be aglass substrate, a quartz substrate, a transparent resin substrate, etc.Also, an adhesion layer may be disposed between the transparentinsulating substrate and the first substrate 110 in order to bond thetransparent insulating substrate and the first substrate 110.

Meanwhile, the encapsulation layer 160 may be omitted when the colorfilter and the black matrix BM additionally serve as an encapsulationlayer.

Although not shown, a capping layer may be additionally included betweenthe common electrode 150 and the encapsulation layer 160. The cappinglayer can prevent light incident on the common electrode 150 from beinglost by total reflection. As an example, the capping layer may be formedas an organic film or an inorganic film.

The black matrix BM may be disposed on the encapsulation layer 160. Theblack matrix BM may be disposed on the encapsulation layer 160 to coveran entire surface of the encapsulation layer 160 except regions ofopening OP2 a. A material with high absorption for visible light may beused for the black matrix BM. As an example, the black matrix BM mayinclude a metal such as chromium (Cr), a metal nitride, a metal oxide, aresin material colored in black, or the like.

The opening OP2 a of the black matrix BM may overlap with the firstorganic light emitting layer 141 and the opening OP1 a of the pixeldefining film 130. Thus, light emitted from the first organic lightemitting layer 141 may pass through the opening OP1 a of the pixeldefining film 130 and the opening OP2 a of the black matrix BM. Althoughnot shown, a buffer layer or an organic layer may be formed between theblack matrix BM and the encapsulation layer 160. The buffer layer or theorganic layer may be formed in a single-layered structure or amulti-layered structure. The opening OP2 a of the black matrix BM maycompletely expose the opening OP1 a of the pixel defining film 130 in aplan view.

The first color filter CF1, the second color filter CF2, and the thirdcolor filter CF3 may be disposed on the black matrix BM. The blackmatrix BM may be disposed at a boundary between the plurality of colorfilters including the first color filter CF1, the second color filterCF2, and the third color filter CF3.

The first color filter CF1 may selectively transmit red light. Here, thered light may have a wavelength ranging from about 620 nm to about 750nm. The second color filter CF2 may selectively transmit green light.Here, the green light may have a wavelength ranging from about 495 nm toabout 570 nm. The third color filter CF3 may selectively transmit bluelight. Here, the blue light may have a wavelength ranging from about 450nm to about 495 nm. As an example, the first color filter CF1, thesecond color filter CF2, and the third color filter CF3 may include aresin containing pigment or dye. As another example, the first colorfilter CF1, the second color filter CF2, and the third color filter CF3may include different materials which are formed through differentprocesses.

As an example, the first color filter CF1, the second color filter CF2,and the third color filter CF3 may have a rhombus shape. Thus, it ispossible to minimize separation distances between the first color filterCF1 and its adjacent color filters. Meanwhile, in FIG. 1, the adjacentcolor filters are shown as not overlapping with each other, but theadjacent color filters may overlap with each other. When the adjacentcolor filters overlap with each other, an overlapped portion may overlapwith the black matrix BM. Also, the shape and size of the first colorfilter CF1, the second color filter CF2, and the third color filter CF3are not limited to those shown in FIGS. 1 and 2. Meanwhile, in thisdisclosure, an example in which a color filter is disposed on the blackmatrix BM has been described. Unlike this, the black matrix BM may bedisposed on the color filter.

FIG. 3 is a view for comparison between FIG. 1, which is a plan view ofa first pixel, and FIG. 2, which is a sectional view taken along lineI-I′. FIG. 4 is a plan view showing a color filter and an opening of ablack matrix of an organic light emitting display device according to acomparative example. For convenience of description, some elementsincluded in the organic light emitting display device may be omitted inFIGS. 3 and 4.

Referring to FIG. 3, the opening OP2 a of the black matrix BM may have acircular shape. That is, the opening OP2 a of the black matrix BM has acircular shape and thus can omnidirectionally and uniformly inducediffraction of light L1 on the basis of the virtual center point cp.Thus, even when light introduced from an external source (hereinafterreferred to as “external light”) is reflected by the first pixelelectrode 121, the organic light emitting display device according to anembodiment of the present inventive concept may omnidirectionally anduniformly induce diffraction of the reflected light L1. Accordingly,with the organic light emitting display device according to anembodiment of the present inventive concept, it is possible to alleviatecolor separation due to external light and visibility degradation due toexternal light reflection.

Referring to FIG. 4, an organic light emitting display device accordingto a comparative example includes a black matrix BMa having a rhombicopening BM_OP and a quadrangular color filter CFa. That is, the openingBM_OP of the black matrix BMa does not have uniform diffraction of lightL2 on the basis of a virtual center point cpa. More specifically, theorganic light emitting display device according to the comparativeexample has different diffraction of light L2 at a vertex a1 and a sidea2 of the rhombic opening BM_OP of the black matrix. Thus, even when theexternal light is reflected, the organic light emitting display deviceaccording to the comparative example does not have uniform diffractionof light L2 (i.e., light L2 is biased in a certain direction), and thuscolor separation may be generated.

FIG. 5 is a view showing that color separation is alleviated in anorganic light emitting display device according to an embodiment of thepresent inventive concept. FIG. 6 is a view showing color separation ofthe organic light emitting display device according to the comparativeexample shown in FIG. 4.

It can be seen from FIG. 6 that color separation is generated in theform of a letter X in the organic light emitting display deviceaccording to the comparative example. On the other hand, it can be seenfrom FIG. 5 that color separation due to external light is alleviated bythe organic light emitting display device according to an embodiment ofthe present inventive concept by omnidirectionally and uniformlyinducing diffraction of light.

Meanwhile, the organic light emitting display device according to anembodiment of the present inventive concept does not include apolarizing plate. That is, the organic light emitting display deviceaccording to an embodiment of the present inventive concept can reducereflection of external light without using the polarizing plate by usingthe color filter and the black matrix BM as disclosed in the embodiment.Also, it is possible to alleviate color separation by forming theopening BM_OP of the black matrix BMa in a circular shape.

FIG. 7 is a plan view showing a pixel layout of an organic lightemitting display device according to another embodiment of the presentinventive concept. FIG. 8 is a sectional view taken along line II-II′shown in FIG. 7. For convenience of description, contents which aredescribed in the foregoing embodiments with reference to FIGS. 1 to 6will be omitted in the following description. The same referencenumerals will be used for the same elements as those shown in FIGS. 1 to6.

Referring to FIGS. 7 and 8, an opening OP2 b of a black matrix BM1 has asmaller area than the opening OP1 a of the pixel defining film 130. Thatis, the opening OP2 b of the black matrix BM1 may fully overlap with aregion of the first pixel electrode 121 exposed by the opening OP1 a ofthe pixel defining film 130.

Accordingly, since the opening OP2 b of the black matrix BM1 has asmaller area than the region of the first pixel electrode 121 exposed bythe opening OP1 a of the pixel defining film 130, external light L3 amay have the same form as light L3 b reflected by the first pixelelectrode 121. Thus, the organic light emitting display device accordingto another embodiment of the present inventive concept may alleviatereflected color separation due to external light.

Also, the opening OP2 b of the black matrix BM1 may have a circularshape. Thus, even when the external light L3 a is reflected by the firstpixel electrode 121, the organic light emitting display device mayomnidirectionally and uniformly induce diffraction of the reflectedlight L3 b. Thus, the organic light emitting display device according toanother embodiment of the present inventive concept may alleviate colorseparation due to external light.

Meanwhile, as long as the opening OP2 b of the black matrix BM1 has asmaller area than the opening OP1 a of the pixel defining film 130, theshape of the opening OP2 b of the black matrix BM1 is not limited to acircular shape. This will be described below in detail with reference toFIGS. 9A and 9B. For convenience of description in FIGS. 9A and 9B, thereference numerals of all the black matrices will be marked as “BM1.”

FIGS. 9A and 9B is a view showing examples of the shape of the openingof the black matrix shown in FIG. 7. Referring to FIG. 9A, an openingOP2 c of the black matrix BM1 may have a polygonal shape close to acircular shape. Alternatively, referring to FIG. 9B, an opening OP2 d ofthe black matrix BM1 may have a quadrangular shape.

The shape of the opening of the black matrix BM1 is not limited to thoseshown in FIGS. 8 and 9, and the opening of the black matrix. BM1 may beformed in various shapes (such as an ellipse, a rhombus, and aparallelogram) in consideration of a required aperture ratio, requiredreflectivity, process conditions, and so on.

Also, a plurality of openings of the black matrix BM1 may have differentshapes and areas. For example, the plurality of openings of the blackmatrix BM1 may have different shapes and areas depending on the type ofan overlapping color filter. As an example, the diffraction degrees ofwavelengths included in the external light (red>green>blue) and thebrightness and lifespan of the organic light emitting layer aredifferent. Thus, the shapes and areas of the plurality of openings ofthe black matrix BM1 may be determined in consideration of thedifference. As an example, an opening overlapping with a green colorfilter among the plurality of openings of the black matrix BM1 may haverelatively the smallest area.

FIG. 10 is a view showing an interval between openings of a pixeldefining film adjacent to an organic light emitting display deviceaccording to another embodiment of the present inventive concept. Thefollowing description with reference to FIG. 10 is based on a referencepixel PX_ref overlapping with a reference color filter CF_ref.

Referring to FIG. 10, an opening OP2_ref of a black matrix BM_ref has asmaller area than an opening OP1_ref of a pixel defining film. That is,the opening OP2_ref of the black matrix BM_ref may fully overlap with aregion of a pixel electrode PE exposed by the opening OP1_ref of thepixel defining film.

Thus, since the opening OP2_ref of the black matrix BM_ref has a smallerarea than the pixel electrode PE capable of reflecting external light,the external light and light reflected by the pixel electrode PE mayhave the same form. Also, the opening OP2 b_ref of the black matrixBM_ref may have a circular shape. Accordingly, the organic lightemitting display device according to another embodiment of the presentinventive concept may alleviate reflected color separation due toexternal light.

Referring to FIG. 10, shortest distances d between the opening OP1_refof the pixel defining film for exposing the pixel electrode PE andopenings of adjacent pixel defining films may be the same as each other.Here, openings adjacent in a first direction d1 and a third direction d3with reference to FIG. 10 are excluded from the openings of the adjacentpixel defining films.

When the shortest distances d between the opening OP1_ref of the pixeldefining film for exposing the pixel electrode PE and openings ofadjacent pixel defining films are different from each other, colorcrosstalk may occur between two adjacent pixels having a relativelysmall shortest distance d. As a result, colors in the two adjacentpixels may be mixed with each other.

With the organic light emitting display device shown in FIG. 10, theshortest distances d between the opening OP1_ref of the pixel definingfilm for exposing the pixel electrode PE and openings of adjacent pixeldefining films may be the same, and thus it is possible to alleviatecolor crosstalk between adjacent pixels. As another example, in additionto the case where the opening OP2_ref of the black matrix BM_ref has asmaller area than the opening OP1_ref of the pixel defining film (i.e.,even when the area of the opening OP2_ref of the black matrix BM_ref islarger than or equal to the area of the opening OP1_ref of the pixeldefining film), the shortest distances d between the opening OP1_ref ofthe pixel defining film and openings of adjacent pixel defining filmsmay be the same.

FIG. 11 is a plan view showing a pixel layout of an organic lightemitting display device according to another embodiment of the presentinventive concept. FIG. 12 is a sectional view taken along line III-III′shown in FIG. 11. However, duplicate content of the foregoingdescription with reference to FIGS. 1 to 10 will be omitted in thefollowing description.

Referring to FIGS. 11 and 12, an opening OP1 b of a pixel defining film130 a may have a circular shape. Also, an opening OP2 a of a blackmatrix BM may have a substantially circular shape. That is, the openingOP1 b of the pixel defining film 130 a and the opening OP2 a of theblack matrix BM have circular shapes, and thus it is possible toomnidirectionally disperse light L1 reflected by a first pixel electrode121. That is, the organic light emitting display device according toanother embodiment of the present inventive concept mayomnidirectionally and uniformly induce diffraction of the light L1reflected by the first pixel electrode 121, and thus it is possible toalleviate color separation due to external light and visibilitydegradation due to reflection of external light.

Meanwhile, in FIGS. 11 and 12, the opening OP1 b of the pixel definingfilm 130 a and the opening OP2 a of the black matrix BM are shown ashaving the same area, but are not limited thereto. As an example, theopening OP2 a of the black matrix BM may have a smaller area than theopening OP1 b of the pixel defining film 130 a. Thus, the external lightand the light reflected by the first pixel electrode 121 may have thesame form.

FIG. 13 is a plan view showing an opening of a black matrix and a colorfilter of an organic light emitting display device according to anotherembodiment of the present inventive concept. For convenience ofdescription, the remaining elements other than a color filter and anopening of a black matrix will be omitted in FIG. 13.

Referring to FIG. 13, a first color filter CFa1 and a third color filterCFa3 may have a quadrangular shape. A second color filter CFa2 may beformed overall along the same column, other than an opening OP2 e of ablack matrix BM2.

Here, as an example, the first color filter CFa1 may be a red colorfilter, and the second color filter CFa2 may be a green color filter.Also, as an example, the third color filter CFa3 may be a blue colorfilter. Locations of the first color filter CFa1 and the third colorfilter CFa3 may be exchangeable with each other.

That is, the organic light emitting display device according to anotherembodiment of the present inventive concept shown in FIG. 13 isdifferent from the organic light emitting display device according to anembodiment shown in FIG. 1 in terms of the shapes of the color filters.However, even in this case, the opening OP2 e of the black matrix BM2may have a circular shape.

Thus, even when external light is reflected by a plurality of pixelelectrodes, it is possible to omnidirectionally and uniformly inducediffraction of the reflected light. Accordingly, with the organic lightemitting display device according to another embodiment of the presentinventive concept, it is possible to alleviate color separation due toexternal light and visibility degradation due to external lightreflection.

FIG. 14 is a plan view showing an opening of a black matrix and a colorfilter of an organic light emitting display device according to stillanother embodiment of the present inventive concept. FIG. 15 is a planview showing a color filter and an opening of a black matrix of anorganic light emitting display device according to a comparativeexample. For convenience of description, only a black matrix, an openingof the black matrix, and a color filter have been shown in FIGS. 14 and15.

Referring to FIG. 14, a color filter CF1 b may sufficiently overlap witha black matrix BM3. Thus, light L4 reflected through a pixel electrodeor the like may minimize diffraction in a side portion (an edge region)of the color filter CFR). As an example, an overlap distance t1 betweenthe color filter CF1 b and the black matrix BM3 may range from about 6μm to about 12 μm.

On the other hand, referring to FIG. 15, an organic light emittingdisplay device according to a comparative example includes a blackmatrix BMa having a rhombic opening BM_OP and a quadrangular colorfilter CFa. That is, the organic light emitting display device accordingto the comparative example has a short overlap distance t2 between thecolor filter CFa and the black matrix BMa. Thus, diffraction ofreflected light L5 may occur in a side portion of the color filter CFa.When the diffraction of the reflected light L5 occurs, color separationand visibility degradation may occur.

Meanwhile, as long as the color filter CF1 b sufficiently overlaps withthe black matrix BM3, an opening OP2 f of the black matrix BM3 need nothave the same shape as the color filter CF1 b.

Even when the opening of the black matrix BM3 has a circular shape, theoverlap distance t1 between the color filter CF1 b and the black matrixBM3 may range, for example, from about 6 μm to about 12 μm.

FIG. 16 is a plan view showing a pixel layout of an organic lightemitting display device according to another embodiment of the presentinventive concept. FIG. 17 is a sectional view taken along lineIV1-IV1′, line IV2-IV2′, and line IV3-IV3′ shown in FIG. 16. In FIGS. 16and 17, a first pixel PX1 a, a second pixel PX2 a, and a third pixel PX3a will be described as an example. However, duplicate content of theforegoing description with reference to FIGS. 1 to 15 will be omitted inthe following description. Also, an opening of a first color filterlayer CFL1 will not be shown in FIG. 16 in order to avoid confusion withother elements.

Referring to FIGS. 16 and 17, the first color filter layer CFL1 may bedisposed on a black matrix BM. The first color filter layer CFL1 mayinclude a plurality of openings having a first opening OP3 a 1 and asecond opening OP3 a 2. Also, the first color filter layer CFL1 overlapswith a third organic light emitting layer 143, an opening OP1 a 3 of apixel defining film 130, and an opening OP2 a 3 of the black matrix BM.That is, the first color filter layer CFL1 may be disposed on the blackmatrix BM to cover an entire surface of the black matrix BM exceptregions of the plurality of openings.

More specifically, the first color filter layer CFL1 may be formed tosurround openings OP2 a 1 and OP2 a 2 of the black matrix BM when viewedfrom the top.

As an example, the first color filter layer CFL1 may be a blue colorfilter layer selectively transmitting blue light. Thus, the third pixelPX3 a may display a blue color.

A first color filter CF1 a may be disposed on the first color filterlayer CFL1. The first color filter CF1 a may overlap with a firstorganic light emitting layer 141, an opening OP1 a 1 of the pixeldefining film 130, and the opening OP2 a 1 of the black matrix BM. As anexample, the first color filter CF1 a may be a red color filterselectively transmitting red light. Thus, the first pixel PX1 a maydisplay a red color.

A second color filter CF2 a may be disposed on the first color filterlayer CFL1. The second color filter CF2 a may overlap with a secondorganic light emitting layer 142, an opening OP1 a 2 of the pixeldefining film 130, and the opening OP2 a 2 of the black matrix BM. As anexample, the second color filter CF2 a may be a green color filterselectively transmitting green light. Thus, the second pixel PX2 a maydisplay a green color.

The first color filter CF1 a and the second color filter CF2 a are notformed overall on the black matrix BM, unlike the first cc for filterlayer CFL1.

FIG. 18 is a diagram illustrating an improvement of reflectivedispersion of the organic light emitting display device shown in FIG.16.

Referring to FIGS. 16 to 18, after the first color filter layer CFL1 isformed, the first color filter CF1 a and the second color filter CF2 aare formed on the first color filter layer CFL1. The first color filterlayer CFL1 is formed overall on the black matrix BM, and the first colorfilter CF1 a and the second color filter CF2 a are formed in an islandshape to at least partially overlap with the first color filter layerCFL1. Thus, the black matrix BM may not include an exposed region. Thus,even when at least one of the first color filter CF1 a and the secondcolor filter CF2 a is misaligned with respect to a center line SL1 orSL2 during a process an exposed area of the black matrix BM may bemaintained at a constant value because the first color filter layer CFL1is formed to cover an entire surface of the black matrix BM exceptregions of the plurality of openings. Here, the degree to which thefirst color filter CF1 a and the first color filter layer CFL1 overlapwith each other and the degree to which the second color filter CF2 aand the first color filter layer CFL1 overlap with each other may bedetermined in consideration of color crosstalk and design margins.

That is, since the first color filter layer CFL1 is formed to cover anentire surface of the black matrix BM except regions of the plurality ofopenings, a region in which the first color filter layer CFL1 and theblack matrix BM are exposed may be maintained in a displayed region DA3although at least one of the first color filter CF1 a and the secondcolor filter CF2 a is misaligned with respect to the center line SL1 orSL2.

When an area in which the black matrix BM is exposed is different foreach location during the process, a dispersion imbalance may occur foreach location. This also means that reflectivity of external light maychange for each location.

With the organic light emitting display device according to anotherembodiment of the present inventive concept, it is possible to alleviatea dispersion imbalance and a reflectivity difference for each region bymaintaining the region in which the first color filter layer CFL1 andthe black matrix BM are exposed in the displayed region DA3.

The openings OP2 a 1, OP2 a 2, and OP2 a 3 of the black matrix BM mayhave a circular shape. That is, since the openings OP2 a 1, OP2 a 2, andOP2 a 3 of the black matrix BM have a circular shape, the organic lightemitting display device may omnidirectionally and uniformly induce lightdiffraction. Thus, even when external light is reflected by first tothird pixel electrodes 121 to 123, the organic light emitting displaydevice may omnidirectionally and uniformly induce light diffraction.Accordingly, with the organic light emitting display device according toanother embodiment of the present inventive concept, it is possible toalleviate color separation due to external light and visibilitydegradation due to external light reflection.

FIGS. 19 to 26 are diagrams illustrating a process of manufacturing theorganic light emitting display device shown in FIG. 16. However,duplicate content of the foregoing description with reference to FIGS.16 to 18 will be omitted in the following description.

Referring to FIGS. 19 to 22, a black matrix BM may be formed oil anencapsulation layer 160. The black matrix BM may be disposed on theencapsulation layer 160 except regions of a plurality of openingsincluding openings OP2 a 1, OP2 a 2, and OP2 a 3. A material with highabsorption for visible light may be used for the black matrix BM.Although not shown, a buffer layer or an organic layer may be formedbetween the black matrix BM and the encapsulation layer 160. The bufferlayer or the organic layer may be formed in a single-layered structureor a multi-layered structure.

Referring to FIGS. 23 and 24, a first color filter layer CFL1 may bedisposed on the black matrix BM. The first color filter layer CFL1 maybe formed overall on the black matrix BM except regions of a pluralityof openings having a first opening OP3 a 1 and a second opening OP3 a 2.

Referring to FIGS. 25 and 26, a first color filter CF1 a and a secondcolor filter CF2 a may be sequentially formed on the first color filterlayer CFL1. The first color filter CF1 a may be formed to cover thefirst opening OP3 a 1 of the first color filter layer CFL1. The secondcolor filter CF2 a may be formed to cover the second opening OP3 a 2 ofthe first color filter layer CFL1. The order in which the first colorfilter CF1 a and the second color filter CF2 a are formed is notparticularly limited.

A method of forming the first color filter layer CFL1, the first colorfilter CF1 a, and the second color filter CF2 a is not particularlylimited. For example, the first color filter layer CFL1, the first colorfilter CF1 a, and the second color filter CF2 a may be formed through aphoto lithography process or an inkjet process. Also, the first colorfilter layer CFL1, the first color filter CF1 a, and the second colorfilter CF2 a need not be formed through the same process. For example,the first color filter layer CFL1 may include a polymer material as thefirst color filter layer CFL1 is formed through the photo process. Thus,the first color filter CF1 a and the second color filter CF2 a mayinclude an ink material as the first color filter CF1 a and the secondcolor filter CF2 a are formed through the inkjet process.

An organic light emitting display device having a low-reflection andno-change structure according to another embodiment will be describedbelow with reference to FIGS. 27 to 30. For comparison with FIG. 17, thefollowing description will be provided with reference to the sectionalviews of FIGS. 27 to 30. However, duplicate content of the foregoingdescription with reference to FIGS. 16 to 26 will be omitted in thefollowing description.

FIG. 27 is a sectional view showing an organic light emitting displaydevice according to another embodiment of the present inventive concept.

Referring to FIG. 27, a second color filter layer CFL2 may be disposedon a first color filter layer CFL1. The second color filter layer CFL2may include a plurality of openings having a first opening OP4 a 1 and asecond opening OP4 a 2. Also, the second color filter layer CFL2overlaps with a first organic light emitting layer 141, an opening OP1 a1 of a pixel defining film 130, and an opening OP2 a 1 of a black matrixBM. That is, the second color filter layer CFL2 may be formed to coveran entire surface of the first color filter layer CFL1 except regions ofthe plurality of openings having a first opening OP4 a 1 and a secondopening OP4 a 2.

More specifically, the second color filter layer CFL2 may be formed tosurround openings OP2 a 2 and OP2 a 3 of the black matrix BM when viewedfrom the top. In other words, the second color filter layer CFL2 may beformed to surround openings OP3 a 1 and OP3 a 2 of the first colorfilter layer CFL1 when viewed from the top.

That is, the second color filter layer CFL2 is formed to cover an entiresurface of the first color filter layer CFL1 except regions of thesecond opening OP4 a 2. At this point, the second color filter layerCFL2 covers the opening OP2 a 1 of the black matrix BM. As an example,the second color filter layer CFL2 may be a red color filter layerselectively transmitting red light. Thus, a first pixel PX1 a maydisplay a red color.

A second color filter CF2 a may be disposed on the second color filterlayer CFL2. The second color filter CF2 a may overlap with a secondorganic light emitting layer 142, an opening OP1 a 2 of the pixeldefining film 130, and the opening OP2 a 2 of the black matrix BM. As anexample, the second color filter CF2 a may be a green color filterselectively transmitting green light. Thus, a second pixel PX2 a maydisplay a green color.

That is, the organic light emitting display device shown in FIG. 27 mayinclude the second color filter layer CFL2 instead of the first colorfilter CF1 a.

FIG. 28 is a sectional view showing an organic light emitting displaydevice according to another embodiment of the present inventive concept.

Referring to FIG. 28, a third color filter layer CFL3 may be disposed onthe second color filter layer CFL2. The third color filter layer CFL3may include a plurality of openings having a first opening OP5 a 1 and asecond opening OP5 a 2. Also, the third color filter layer CFL3 overlapswith the second organic light emitting layer 142, the opening OP1 a 2 ofthe pixel defining film 130, and the opening OP2 a 2 of the black matrixBM. That is, the third color filter layer CFL3 may be formed to cover anentire surface of the second color filter layer CFL2 except regions of aplurality of first openings OP5 a 1 and a plurality of second openingsOP5 a 2.

More specifically, the third color filter layer CFL3 may be formed tosurround the openings OP2 a 1 and OP2 a 3 of the black matrix BM whenviewed from the top.

As an example, the third color filter layer CFL3 may be a green colorfilter layer selectively transmitting green light. Thus, the secondpixel PX2 a may display a green color.

That is, the organic light emitting display device shown in FIG. 28 mayinclude the third color filter layer CFL3 instead of the second colorfilter CF2 a.

FIG. 29 is a sectional view showing an organic light emitting displaydevice according to another embodiment of the present inventive concept.

Referring to FIG. 29, a fourth color filter CF4 may be disposed on thefirst color filter layer CFL1. The fourth color filter CF4 may overlapwith the first organic light emitting layer 141, the second organiclight emitting layer 142, the openings OP1 a 1 and OP1 a 2 of the pixeldefining film 130, and the openings OP2 a 1 and OP2 a 2 of the blackmatrix BM. As an example, the fourth color filter CF4 may be a yellowcolor filter selectively transmitting yellow light.

The types of the colors of the first color filter layer CFL1, the secondcolor filter layer CFL2, and the third color filter layer CFL3 and theorder in which the first color filter layer CFL1, the second colorfilter layer CFL2, and the third color filter layer CFL3 are formed arenot particularly limited. However, when the first color filter layerCFL1 formed on the lowest portion among the color filters or the colorfilter layers is a blue color filter layer having relatively lowtransmissivity, it is possible to enhance quality of displayed images.Also, the first color filter layer CFL1, the second color filter layerCFL2, and the third color filter layer CFL3 have been described as ablue color filter layer, a red color filter layer, and a green colorfilter layer, respectively, but are not limited thereto. For example,each of the first color filter layer CFL1, the second color filter layerCFL2, and the third color filter layer CFL3 may be any one of a cyancolor filter layer, a magenta color filter layer, and a yellow colorfilter layer.

FIG. 30 is a sectional view showing an organic light emitting displaydevice according to another embodiment of the present inventive concept.

Referring to FIG. 30, unlike FIG. 17, a first color filter CF1 c and asecond color filter CF2 c may be formed before a first color filterlayer CFL1 a is formed. That is, the first color filter CF1 c and thesecond color filter CF2 c may be sequentially formed on a black matrixBM, and the first color filter layer CFL1 a may be formed to cover anentire surface of the remaining regions other than regions where thefirst color filter CF1 a and the second color filter CF2 a are disposed.That is, the first color filter layer CFL1 a may be formed to surroundopenings OP2 a 1 and OP2 a 2 of the black matrix BM when viewed from thetop.

FIG. 31 is a plan view showing a pixel layout of an organic lightemitting display device according to still another embodiment of thepresent inventive concept. FIG. 32 is a sectional view taken along lineV1-V1′, line V2-V2′, and line V3-V3′ shown in FIG. 31.

Referring to FIGS. 31 and 32, openings OP2 b 1, OP2 b 2, and OP2 b 3 ofa black matrix BM1 a have smaller areas than openings OP1 a 1, OP1 a 2,and OP1 a 3 of a pixel defining film 130. That is, the openings OP2 b 1,OP2 b 2, and OP2 b 3 of the black matrix BM1 a may fully overlap withregions of a first pixel electrode 121 exposed by the openings OP1 a 1,OP1 a 2, and OP1 a 3 of the pixel defining film 130.

Accordingly, since the openings OP2 b 1, OP2 b 2, and OP2 b 3 of theblack matrix BM1 a have smaller areas than regions of the first pixelelectrode 121, a second pixel electrode 122, and a third pixel electrode123 exposed by the openings OP1 a 1, OP1 a 2, and OP1 a 3 of the pixeldefining film 130, external light may have the same form as lightreflected by the first pixel electrode 121, the second pixel electrode122, and the third pixel electrode 123.

Also, the openings OP2 b 1, OP2 b 2, and OP2 b 3 of the black matrix BM1a may have a circular shape. Thus, even when external light is reflectedby at least one of the first pixel electrode 121, the second pixelelectrode 122, and the third pixel electrode 123, it is possible toomnidirectionally and uniformly induce diffraction of reflected light.Accordingly, with the organic light emitting display device according tostill another embodiment of the present inventive concept, it ispossible to alleviate color separation due to external light andvisibility degradation due to external light reflection.

As long as the openings OP2 b 1, OP2 b 2, and OP2 b 3 of the blackmatrix BM1 a have smaller areas than the openings OP1 a 1, OP1 a 2, andOP1 a 3 of the pixel defining film 130, the openings OP2 b 1, OP2 b 2,and OP2 b 3 of the black matrix BM1 a are not limited to a circularshape.

Meanwhile, in FIGS. 16 to 32, the opening of the first color filterlayer CFL1 is shown as having the same size as the first color filterCF1 a or the second color filter CF2 a. However, this is for convenienceof description, and the present inventive concept is not limitedthereto.

According to embodiments of the present inventive concept, it ispossible to alleviate reflected color separation due to external light.

It is also possible to reduce costs by using no polarizing plate.

It is also possible to implement uniform dispersion characteristics andreduce reflectivity.

What is claimed is:
 1. An organic light emitting display devicecomprising: a substrate; a first pixel electrode disposed on thesubstrate; a pixel defining film disposed on the first pixel electrodeand having a first opening at least partially exposing the first pixelelectrode; a first organic light emitting layer disposed on the pixeldefining film and overlapping with the first opening of the pixeldefining film; and a black matrix disposed on the first organic lightemitting layer and having a first opening overlapping with the firstorganic light emitting layer, wherein light having passed through thefirst opening of the black matrix is one of red light, green light, andblue light, and the first opening of the black matrix has a circularshape which is composed of assemblies of dots that are spaced a samedistance apart from a virtual center point of the first opening of theblack matrix.
 2. The organic light emitting display device of claim 1,wherein the first opening of the black matrix has a smaller area thanthe first opening of the pixel defining film.
 3. The organic lightemitting display device of claim 1, further comprising a color filterdisposed to cover the first opening of the black matrix.
 4. The organiclight emitting display device of claim 3, further comprising anencapsulation layer disposed on the pixel defining film, wherein theblack matrix and the color filter are disposed on the encapsulationlayer.
 5. The organic light emitting display device of claim 3, whereina width of a region in which the black matrix overlaps with one side ofthe color filter ranges from 6 μm to 12 μm.
 6. The organic lightemitting display device of claim 1, wherein the first opening of thepixel defining film is substantially circular.
 7. The organic lightemitting display device of claim 1, further comprising: a second pixelelectrode disposed on the same layer as the first pixel electrode; and asecond organic light emitting layer disposed on the pixel defining filmand overlapping with the second pixel electrode, wherein the pixeldefining film further comprises a second opening at least partiallyexposing the second pixel electrode, the black matrix further comprisesa second opening overlapping with the second organic light emittinglayer, and light having passed through the second opening of the blackmatrix has a different display color from the light having passedthrough the first opening of the black matrix.
 8. The organic lightemitting display device of claim 7, wherein the second opening of theblack matrix has a shape with a curved portion.
 9. The organic lightemitting display device of claim 7, further comprising: a third pixelelectrode disposed on the same layer as the first pixel electrode; and athird organic light emitting layer disposed on the pixel defining filmand overlapping with the third pixel electrode, wherein the pixeldefining film further comprises a third opening at least partiallyexposing the third pixel electrode, the black matrix further comprises athird opening overlapping with the third organic light emitting layer,and light having passed through the third opening of the black matrix,the light having passed through the first opening of the black matrix,and the light having passed through the second opening of the blackmatrix have different display colors.
 10. The organic light emittingdisplay device of claim 9, wherein a shortest distance from the secondopening of the pixel defining film to the first opening of the pixeldefining film is the same as a shortest distance from the second openingof the pixel defining film to the third opening of the pixel definingfilm.
 11. The organic light emitting display device of claim 9, furthercomprising a first color filter layer disposed on the black matrix andincluding a first opening overlapping with the first opening of theblack matrix and a second opening overlapping with the second opening ofthe black matrix, wherein the first color filter layer overlaps with thethird opening of the black matrix and surrounds the first opening of theblack matrix and the second opening of the black matrix.
 12. The organiclight emitting display device of claim 11, wherein the first colorfilter layer is a blue color filter layer for transmitting blue light.13. The organic light emitting display device of claim 11, furthercomprising: a first color filter overlapping with the first opening ofthe first color filter layer; and a second color filter overlapping withthe second opening of the first color filter layer.
 14. The organiclight emitting display device of claim 11, further comprising a secondcolor filter layer disposed on the first color filter layer andoverlapping with the first opening of the black matrix, wherein thesecond color filter layer surrounds the second opening of the firstcolor filter layer.
 15. The organic light emitting display device ofclaim 9, further comprising: a first color filter overlapping with thefirst opening of the black matrix; a second color filter overlappingwith the second opening of the black matrix; and a first color filterlayer disposed on the first color filter and the second color filter,wherein the first color filter layer overlaps with the third opening ofthe black matrix and surrounds the first opening of the black matrix andthe second opening of the black matrix.
 16. An organic light emittingdisplay device comprising: a substrate; a first pixel electrode disposedon the substrate; a pixel defining film disposed on the first pixelelectrode and having a first opening at least partially exposing thefirst pixel electrode; a first organic light emitting layer disposed onthe pixel defining film and overlapping with the first opening of thepixel defining film; and a black matrix disposed on the first organiclight emitting layer and having a first opening overlapping with thefirst organic light emitting layer, wherein the first opening of theblack matrix has a smaller area than the first opening of the pixeldefining film, and the first opening of the black matrix has a circularshape which is composed of assemblies of dots that are spaced a samedistance apart from a virtual center point of the first opening of theblack matrix.
 17. The organic light emitting display device of claim 16,wherein the first opening of the pixel defining film is substantiallycircular.
 18. The organic light emitting display device of claim 16,wherein light having passed through the first opening of the blackmatrix is one of red light, green light, and blue light.
 19. The organiclight emitting display device of claim 16, further comprising a firstcolor filter disposed to cover the first opening of the black matrix,wherein a width of a region in which the black matrix overlaps with oneside of the color filter ranges from 6 μm to 12 μm.
 20. The organiclight emitting display device of claim 16, further comprising a secondpixel electrode and a third pixel electrode disposed on the same layeras the first pixel electrode, wherein the pixel defining film furthercomprises a second opening at least partially exposing the second pixelelectrode and a third opening at least partially exposing the thirdpixel electrode, the black matrix further comprises a second openingoverlapping with the second pixel electrode and a third openingoverlapping with the third pixel electrode, and light having passedthrough the first opening of the black matrix, light having passedthrough the second opening of the black matrix, and light having passedthrough the third opening of the black matrix have different displaycolors from one another.
 21. The organic light emitting display deviceof claim 20, further comprising a first color filter layer disposed onthe black matrix and including a first opening overlapping with thefirst opening of the black matrix and a second opening overlapping withthe second opening of the black matrix, wherein the first color filterlayer overlaps with the third opening of the black matrix and surroundsthe first opening of the black matrix and the second opening of theblack matrix.
 22. The organic light emitting display device of claim 21,wherein the first color filter layer is a blue color filter layer fortransmitting blue light.
 23. The organic light emitting display deviceof claim 21, further comprising a yellow color filter overlapping withthe first opening and the second opening of the first color filterlayer.
 24. The organic light emitting display device of claim 21,further comprising a second color filter layer disposed on the firstcolor filter layer and overlapping with the first opening of the blackmatrix.
 25. An organic light emitting display device comprising: asubstrate; a first pixel electrode disposed on the substrate; a pixeldefining film disposed on the first pixel electrode and having a firstopening at least partially exposing the first pixel electrode; a firstorganic light emitting layer disposed on the pixel defining film andoverlapping with the first opening of the pixel defining film; and ablack matrix disposed on the first organic light emitting layer andhaving a first opening overlapping with the first organic light emittinglayer, wherein light having passed through the first opening of theblack matrix is one of red light, green light, and blue light, and thefirst opening of the black matrix has a circular shape or anon-elliptical polygonal shape similar to a circle which is composed ofassemblies of dots that are each spaced apart from a center point of theopening at a distance defined by the center point of the first openingand a circular or polygonal shaped perimeter of the first opening.